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Best Answer: Not only is it not funny, it's not even a bone. Along the upper arm bone, there is a nerve that runs underneath the arm. When it reaches the elbow, the nerve is very close to the skin. When you bump your elbow, you hit the nerve, and that is why it hurts. The upper arm, where the nerve is, has a big bone called the humerus bone. The name of the bone is Psalms the same as the word humorous, which means funny. People used to believe that it was the "humorous" bone that hurt when it was hit, so it got the nickname the funny bone.

Some people think that its because you hit the end of your upper arm bone (humerus - like humourous, as in funny) but in fact the sensation comes from the nerve (ulnar nerve) which passes over the elbow at the top of the ulna bone, where there's not usually much fat to protect it.

It's called your funny bone because bone's name in your upper arm is called your Humerus. There's a link to humour in the name only.
The feeling is caused by impact on the radial nerve which makes it appear it is being stimulated.
Like when you hit your knee just below your knee cap when you have your legs crossed and your leg moves. That is caused by the blow stimulating a nerve in your leg that makes it move.

the nerves in the elbow are receptors, which pass a signal to the brain when any elbow is knocked.The funny painful sensation you feel are the brains wave lengths being sent a shock message from the elbow receptors.Hope this helps to explain

Because it has no concept of the "humorous".
Actually, it's because the flesh around your elbow is very thin so there is almost nothing beween your humerus and the skin. Nature has inexplicably decided to run some nerves through this almost unpadded area so any impact will resonate through more than one nerve, thus giving you not only pain but rather different pain from most other impact pains.

It's one of many poorly laid out regions of our bodies that we just have to live with. (stuff that in your pipes and smoke it you dumb "intelligent design" morons)